A warehouse worker applies lubricant to the axle of a pulley system used to lift heavy crates.
Lubricating the pulley axle helps to:
decrease the gravitational potential energy gained by the crates
decrease the efficiency of the pulley system
increase the efficiency of the pulley system
increase the amount of energy wasted as thermal energy
38 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.